Websites are built to promote a business, showcase products, highlight special promotions, communicate with customers and in some cases provide password protected content.
A website that works, pulls it’s weight. It is one that tells you about your visitors. Tells you where your website users come from (ie how they find your site). A website that works can tell you where your visitors live, their age, gender and even their interests. Websites are very telling when you put them to work.